SCAG develops and applies state-of-the-art models to support SCAG’s planning programs. These models include:

  • Trip-Based Transportation Model
  • Activity-Based Model
  • Heavy-Duty Truck Model
  • Scenario Planning Model
  • Land Use Model
  • Growth Forecast & Allocation Models
  • Air Quality Model

Modeling and Forecasting Framework

SCAG utilizes an integrated analytical framework (See Modeling and Forecasting Framework) to develop growth projections, travel forecasts, and emissions estimates to support the Region’s various planning programs. In addition, SCAG also maintains a robust subregional modeling and data service program that is essential to the analysis of many of the region’s projects and programs.

The primary functions of the Modeling and Forecasting Department include: a) working collaboratively with local jurisdictions to develop socioeconomic growth forecasts as required for regional and local planning; b) providing modeling services for the development and implementation of SCAG’s plans, programs, and projects; c) developing and maintaining SCAG’s various analytical tools and data to more effectively forecast travel demand and estimate resulting air quality; d) providing member services through a robust subregional modeling and data distribution program; e) promoting state of the art modeling practices; and, f) coordinating modeling activities within the SCAG Region.


Scenario Planning Model

SPM Logo

The SCAG Scenario Planning Model (SPM) is a comprehensive web-based land use sketch planning tool for scenario development, modeling, and data organization developed to support a collaborative and seamless local and regional plan development process.


Transportation Models

SCAG develops and maintains state-of-the-art transportation models to support SCAG’s planning program. These models include:

Transportation Model thumbnail

These models are applied by SCAG to forecast transportation conditions and resulting air quality.


Member Services

SCAG maintains an active model and data distribution function for member agencies and other stakeholders. SCAG provides modeling data to support stakeholders’ planning programs and to assist in the development and maintenance of city and subregional models. SCAG provides modeling data services to member agencies, universities, and other public agencies by providing model setups, model input data, and model results.